JEE Advanced 2026 Chemistry question
Not in JEE Main or NEET syllabus
At a given temperature, of acetic acid in of water is shaken with of charcoal and the pH of the resulting solution is . Assume, the adsorption of acetic acid from the aqueous solution by charcoal follows Freundlich isotherm,
=
If the plot of against gives a straight line with slope , the value of in is .
Given: The molar mass of acetic acid is . The acid dissociation constant of acetic acid is at the given temperature. is the mass (in grams) of acetic acid adsorbed. is the mass (in grams) of charcoal. is the equilibrium concentration of acetic acid in the solution after the adsorption is complete. and are constants for acetic acid–charcoal system at the given temperature.
Solution
**Step 1 — equilibrium concentration from the pH.** . For a weak acid,
=\ \ C===0.1\ mol L^{-1}.
**Step 2 — acetic acid left in so
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